Compared to its value today, its advisable to buy coins on this kind of status. If you would have enough fund to support buying both bitcoin and some pf the strong altcoins then better allocate your funds. If you dont trust enough altcoins, put little unto it and give BTC a large portion. All have a possible profit. Go for many.
I think it is better to focus on altcoins now. They usually give more profit with the growth of bitcoin than bitcoin itself. On the other hand,if bitcoin does not grow, and will continue to fall, then there is no point in investing money in anything.This is indeed the best time yet prices of coins in the market is still low.
not this time 
Then when is the time you would set in? If the price is already soaring up high? : D